FOAMING START PRESSURE PRESUMING METHOD IN EXTRUSION FOAMING, METHOD AND DEVICE FOR EXTRUSION FOAMING SIMULATION, AND RECORDING MEDIUM STORING EXTRUSION FOAMING SIMULATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To accurately presume the foaming start pressure in the extrusion foaming and provide an extrusion foaming simulation of high accuracy considering the foam core formation and foaming growth simultaneously in a die based on the result of presumption. SOLUTION: First, the substantial foaming core formation rate as a value of the start of the formation of foam substantially is set as the foam core formation rate representing the number of foams formed per unit volume and unit time (S1). Then the substantial foam core formation rate and other extrusion conditions and the like are substituted for a foam core formation rate formula (S2), and the resin pressure as the foaming start pressure is computed based on the above rate formula (S3). The substantial foaming start pressure in the extrusion foaming can be presumed accurately by the arrangement. Also a simulation considering simultaneously the foam core formation and foam growth in a die is performed by using the above result to provide the extrusion foaming simulation of high accuracy based on the actual phenomenon.